Antenna sharing apparatus for switchable transmit/receive filters
US4980660A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 1988 |
| Grant date | Dec 25, 1990 |
| Priority date | — |
| Expiry date | Jun 6, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/50
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Antenna sharing device used for a communications system such as a land mobile radiotelephone which has a transmitting frequency and a receiving frequency that are different from each other, and which commonly uses the antenna transmission and reception. The bands of transmission and reception of the antenna sharing device are each divided into half and are switched into a pair of sending side low-pass filter and a receiving side low-pass filter and a pair of sending side high-pass filter and a receiving side high-pass filter by a switching device, whereby the band widths of transmission and reception are narrowed and the isolation point is increased between the transmission and reception.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.